19495440 has 60 divisors (see below), whose sum is σ = 65474604. Its totient is φ = 5198592.

The previous prime is 19495439. The next prime is 19495451. The reversal of 19495440 is 4459491.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11943936 + 7551504 = 3456^2 + 2748^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 19495395 and 19495404.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12819 + ... + 14258.

Almost surely, 2^19495440 is an apocalyptic number.

19495440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19495440 is an abundant number, since it is smaller than the sum of its proper divisors (45979164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19495440 is a wasteful number, since it uses less digits than its factorization.

19495440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27096 (or 27087 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 19495440 is about 4415.3640846481. The cubic root of 19495440 is about 269.1396482427.

The spelling of 19495440 in words is "nineteen million, four hundred ninety-five thousand, four hundred forty".